Questions tagged [high-current]

Say how much current is required, high-current means different things to different people.

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THT power transistor clamp mounting

I have a question regarding mounting THT power transistors (TO220, TO247...). I am building a output full bridge for a welder and I thought about not using PCB at all for the power terminals (D,S). It'...
tomstr21's user avatar
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1 answer
66 views

X-ray power input and power output Confusion

I was looking at the power calculations of the X-ray machines and found something a bit unusual. As we know the input power must be equal to the output power. Considering an x-ray machine giving an ...
kam1212's user avatar
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High current, low voltage pulsed DC transformer

I'm trying to understand the feasibility of a DC transformer that takes a low voltage, high current pulse and converts it to a lower voltage, higher current pulse (with a resistive load on the output)....
Mandias's user avatar
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STM32F407 Heating up, the decoupling capacitors showing short to ground with multimeter but microcontroller seems working fine

I have an stm32f407 which was running okay for like a month. but now i am seeing that whenever I connect power supply the current consumption is very high and the MCU is heating up a lot. The ...
Mir Hamza's user avatar
6 votes
1 answer
187 views

Is this circuit suitable for switching 3 kA? [closed]

So I wish to switch a current of roughly 3 kA on for short periods of time roughly every second. I have created a circuit shown below which I believe will be sufficient but after past failures I would ...
leasthollow's user avatar
1 vote
0 answers
16 views

Coordination Protection (Selective and Sensitive) [closed]

How to determine the sensitivity and selectivity of OCR relay? What parameters need to be considered? Are there any limits or standards of these? Or these are any formula for these parameter?
Cristian Agung P 1907156221's user avatar
1 vote
1 answer
32 views

Over-current/short-circuit protection for the battery bank

I am using a 24 V 100 A additional vehicle alternator for charging my additional battery bank of 24 V. I need an over-current/short-circuit protection for my battery bank. I am considering using a DC ...
James Ross's user avatar
2 votes
2 answers
52 views

Transient output voltage on high-side MOSFET switch upon start up

For my application, I am using 4S10P Li-ion battery (with NXP's RDDRONE-BMS772) to power the following load: 8 ESCs to control thrusters 1 Raspberry Pi with hat to control ROV (powered from 5V buck ...
Quang's user avatar
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HV and LV transformer coupling not working, no current from LV transformer?

I am trying to couple a high voltage transformer (automobile coil) 220 V to 10 kV, with a low voltage home made transformer 220 V to 6, 12 V (think MOT but bigger). I have tested/used the LV ...
user1570144's user avatar
1 vote
1 answer
83 views

High Current Step-Down Conversion 12V-5V/100A

I inherited two 12 V, 1200 W server power supplies a while back and I'd like to press them into service as electrolysis cell power supplies for making (per)chlorates. I need to drop the output to ~5 ...
Franklin Knight's user avatar
0 votes
2 answers
80 views

How to calculate the size of copper strip with high current and high frequency?

We can easily find the recommended cross-sectional area of copper wire when the current is DC. But when the frequency is high, e.g., 13.56MHz, how could we calculate a suitable size of copper strip to ...
Mingan's user avatar
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1 vote
1 answer
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How to convert low voltage digital signal (0-3.3V) to high power current signal 15-40W ranging from 1kHz to 1MHz?

I need to convert a digital signal generated from a microcontroller GPIO (0-3.3V) to a high-power (15-40W) current signal to drive an LED chip for illuminance, where the signal frequency can range ...
hailstone's user avatar
1 vote
2 answers
85 views

How much resistance do I need to discharge my capacitor without hurting it [closed]

I’m building a coil-gun and I just got a 400 V 1.3 mF electrolytic capacitor which will discharge a large current. However, my coil is made of 1 mm^2 copper enamel wire which has an resistance of only ...
Joshua's user avatar
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3 votes
2 answers
118 views

Why don't we use the third harmonic in power transmission?

For some high power high voltage lines DC is used with the advantage that sinus wave AC obviously doesn't use the line to it's maximum capacity at all times. To correct this, we could use square wave ...
Čäřý's user avatar
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1 answer
37 views

Reducing current for 5x5 IR transmitter matrix

I'm currently working on a project that involves a 25 IR transmitter matrix, with each individual IR transmitter requiring around 50mA of current. This results in a total current requirement of ...
Krishna Bansal's user avatar
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43 views

What characteristics should I be looking in to choose a MOSFET?

I have an application which I need to switch a 1000 W 24 V 40 A inverter on, and I do need a way to switch it on with a MOSFET (I don't understand the way how to choose it properly) although in the ...
Hazardous Voltage's user avatar
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1 answer
37 views

Current limiting in a ESC

How is current limited in high-power circuits such as ESCs, considering that they might provide tens of Amperes of current?
Constlo's user avatar
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How do I power an inverter using a combination of a car and an external battery but limit the current taken from the car to only 100A?

The car in question is a Nissan Leaf, whose 12V "starter" battery is replenished by an onboard DC-DC converter with a maximum safe output of about 100A (this is used as a handy way to tap ...
LMF5000's user avatar
1 vote
0 answers
57 views

Protection of the power supply input from high voltage pulses

I am assembling a power supply for xenon arc lamps. I use a simple welding inverter as a stable current source. I use the presented scheme. The ignition circuit generates pulses up to 25-30 kV for a ...
Typeof undefined's user avatar
0 votes
1 answer
45 views

Why are pads not connected all way around in copper filled areas? [duplicate]

I'm designing a circuit that will supposedly pass 30A continuous, I assumed the best I can do to prevent tracks from burning is just use copper fill so that essentially the whole area is my high ...
php_nub_qq's user avatar
2 votes
2 answers
159 views

Is it ok to connect a 10000 μF Capacitor to a lithium-ion battery directly?

I have a 24 V lithium-ion battery which will pump as Iᵐᵃˣ 40 A and I need to connect a capacitor directly to the 24 V battery which will be 10000 μF(10 mF). The usage of it is to keep the system ...
Hazardous Voltage's user avatar
1 vote
2 answers
29 views

DC-DC Powering Sensitive IO ICs

I have a high-powered buck DC-DC board with low RDSON FET's (10-20 A) that powers IC's that are sensitive to noise on the IO circuitry. I've done the usual of input/output bypass caps, RC snubbers, ...
electronuts's user avatar
0 votes
1 answer
40 views

Can I connect an off-the-shelf boost converter and a buck converter end to end?

I have a 9~15 volt source (a battery) that I need to turn into stable 12 volts efficiently. The load (a graphics card) will draw up to 200 watts. Can I just get a boost converter and a buck converter ...
Ansis Māliņš's user avatar
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40 views

Need help with high current step up DC

I need to design external battery for my flash. I have checked it works with 4-6v DC with ~6a current to charge the capacitor in 2-3 second. I have 18650 battery planning to use in 1S configuration. ...
vicky kumar's user avatar
0 votes
4 answers
243 views

How to drive high and low side FET with 3.3V microcontroller?

This picture describes the current state of my project that I am working on. I am making a half-bridge high-current motor driver (that will eventually evolve into a full-bridge). The motor is ...
theph's user avatar
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1 vote
1 answer
86 views

LTspice 1000A simulation

I want to simulate a 1000A current flowing through a circuit in LTspice. The supply voltage is 230V AC @ 50Hz. This circuit will also have 0.05 milliohm in series with the load (this resistor acts as ...
JoeyB's user avatar
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0 votes
1 answer
85 views

Looking for alternative analog/digital circuits to drive low impedance with high current

I am looking to drive a load with the specifications as follows: Load Resistance = 2.2 ±0.3 Ω Load Current = 1.5-4.5 A Nominal Load Current = 2 A The load current should never go below 1.25 A at any ...
Debugger_Op's user avatar
8 votes
3 answers
762 views

high current PCB traces: do we need many?

According to some calculations on this site (using standardized IPC-2221) it seems that a set of parallel traces handles more current than if they are joined in a single trace. Why? https://www.4pcb....
Victor Suarez's user avatar
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48 views

Maximum current drawn from transformer

I'm using the following transformer with the output in a parallel configuration such that the input is 230V and the output is 12V. considering the tranformer is rated for 100VA this means the maximum ...
KMN's user avatar
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-1 votes
1 answer
102 views

Is it possible to damage your respiratory system from high current circuits by breathing in air pollutants from hot components? [closed]

I was working on a BLDC motor circuit in my apartment which has 1 small room and not much airflow. I am using up to 30V and 10A to drive the motor. Because I am still testing on a breadboard, a lot of ...
Trev347's user avatar
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1 vote
1 answer
89 views

Driving high power direction indicator LED

I am using a direction indicator LED "2BA 013 398-03" from Hella for our robot. The system power is 24 V. The main microcontroller that also controls the LED on/off, can not provide the ...
O. Efeoglu's user avatar
1 vote
2 answers
139 views

How do you safely measure large AC currents using a multimeter without a current clamp?

I would like to measure the RMS current draw of several house appliances, in addition to the primary and secondary side current of a step-down transformer. Simply placing my multimeter in series with ...
A.H.Z's user avatar
  • 633
2 votes
2 answers
184 views

I need to build a high current, low voltage buck converter

I am trying to power a 14 mΩ resistive load at 0.3 V 21.5 A to add some buffer to the design I'm trying to design for 30 A, since the load can change. Without going too in depth the load is a new ...
user336223's user avatar
0 votes
2 answers
52 views

BQ2054: Studying the impact of high-current charging EV Li-po batteries at high C-rates and most common charging methods used

I am trying to replicate the charging method of fast-charging stations for electric vehicles using one or two Li-po cells. The purpose of the experiment is to measure the impact of high C-rates on Li-...
Carmen Selva's user avatar
0 votes
1 answer
88 views

BMS design for 150 A continuous current

I have to design a BMS for a 12s, 1p battery configuration. I am using a BQ76952 IC to do voltage measurement and passive balancing. The continuous discharge current is 150 A and peak current is 300 A....
Uzair's user avatar
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1 vote
1 answer
49 views

How to sense if a heater is plugged and on

I want to remotely check if one of my home sockets (which happens to power a heater) is transmitting current or not. I do this as a hobby project, so my main priority is to learn through the process ...
Martel's user avatar
  • 1,215
0 votes
1 answer
56 views

Connecting a shunt capacitor with a small resistance in series

Will this circuit draw too much current from my power supply? I have this schematic that I found from similar work to mine. However, they seem to have used a very small resistance before the large ...
Jerard Vincent Ang's user avatar
0 votes
0 answers
58 views

High current traces (up to 60 A) routing problem

I need to design a power inverter that might have up to 60 A of current flowing through the leg IGBTs and still could not figure out the best way out for that amount of current. The DC bus voltage may ...
Iron Maiden's user avatar
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0 votes
0 answers
46 views

How to measure and control AC current in BLDC motor

I tried to measure the AC current for the BLDC motor in a single phase (Phase B). I use Timer 1 to generate PWM and Timer 4 for changes that occur in the commutation state (ie step change occurs ...
Surendran 's user avatar
3 votes
2 answers
317 views

Can I connect aluminium conductor to copper bus bar?

This is a follow-up for the aluminum bar question here: Aluminum bus bars connection to PCB My design now is based on copper - low resistance, assembly by soldering. For now, this is probably the best....
TQQQ's user avatar
  • 841
1 vote
2 answers
140 views

In practice, is the ganging of a large number of SCRs in parallel often more expensive than an equivalent hockey puck?

In a separate but related question, I asked how EEs normally wire a large number of SCRs in parallel for high current applications. For this 1 example (sample size = 1), I found a single hockey puck ...
James Strieter's user avatar
0 votes
2 answers
166 views

How does an IGBT 120A, 450 watt welding machine inverter mechanism work?

How can "RYU Weld Machine Inverter 120A IGBT 450 watt" be advertised so? Does it really output less than 4V? How is such a rating determined?
Nonok cantik's user avatar
0 votes
0 answers
42 views

How can I switch polarity for high power device?

I have a power supply that can deliver from 0 to 1400W (100V - 14A) to an electromagnet. I want to be able to switch the polarity with an electrical signal. I cannot use mechanical relays because it ...
KaboomPhysicist's user avatar
3 votes
2 answers
327 views

How to dynamically simulate an EV plug disconnection in order to automate charging power setup

I bought a well-made Chinese charger for our Zoe ZE50 R110 electric vehicle. It can be set to various charging levels (8,10,12,16A at 220V), but as a safety (I guess), the procedure requires me to ...
MoonCactus's user avatar
2 votes
1 answer
134 views

Power transformer with four similar secondary windings connected in parallel

I need help with the math that is glossed over in nearly every explanation I can find on the web. I have a transformer with a toroid core and primary that were professionally assembled and rated at ...
40150JD's user avatar
  • 23
1 vote
1 answer
85 views

PCBs for ultra-high current

How are PCBs that handle ultra-high current designed? For example, there are IGBTs on Digi-Key that are rated at > 200 A and can be soldered onto a PCB. How do those parts get utilized? Wouldn't ...
RGB Engineer's user avatar
1 vote
1 answer
81 views

Making a MOSFET-based constant 14 VDC input to constant 11 VDC (8-20 A) output voltage regulator circuit

I have a constant 14 VDC source and I want to get a constant regulated output of 11 VDC regardless of the load current, knowing that the load is varing from 8 to 20 A with low frequency. What is the ...
Marko Turner's user avatar
13 votes
6 answers
4k views

How to measure current up to 1000A and not go bankrupt

I need to measure current going through my PCB, which can be anything between -1200A to +1200A. Accuracy within 1-2% with bandwidth of anything higher than 50kHz. The conductor is decided by now - I ...
TQQQ's user avatar
  • 841
4 votes
3 answers
476 views

Battery fuses breaking capacity: main and accessories

I am looking to size several fuses' breaking capacities on a battery circuit. Let's consider F1 = 300 A; F2 = 20 A; F3 = 40 A. Given the battery is high-power and can output several kAs, the main fuse ...
VoltsAndNuts's user avatar
7 votes
6 answers
2k views

How do high current paths work in PCB design?

Using a calculator like this one I see that the trace width required for 10 A is 9.36 mm at 2 oz (highest JLCPCB offers). My IRLZ44N transistor has 2.54 mm spaced legs, so how does putting two 10 mm ...
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